Add WebAuthn bindings and client interface.

third_party/WebKit/Source/modules/webauthentication/WebAuthnAttestation.idl

Index: third_party/WebKit/Source/modules/webauthentication/WebAuthnAttestation.idl
diff --git a/third_party/WebKit/Source/modules/webauthentication/WebAuthnAttestation.idl b/third_party/WebKit/Source/modules/webauthentication/WebAuthnAttestation.idl
new file mode 100644
index 0000000000000000000000000000000000000000..0ad1bff1d022b3870ca29725db3257e059103db8
--- /dev/null
+++ b/third_party/WebKit/Source/modules/webauthentication/WebAuthnAttestation.idl
@@ -0,0 +1,15 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/webauthn/#webauthnattestation
+
+[
+    RuntimeEnabled=WebAuthentication,
+    SecureContext

[esprehn, 2016/11/29 06:00:49]

These should all probably have constructors.

[kpaulhamus, 2016/12/20 19:17:00]

Tracking with https://github.com/w3c/webauthn/issues/313

+] interface WebAuthnAttestation {
+    readonly attribute USVString format;
+    readonly attribute ArrayBuffer clientData;
+    readonly attribute ArrayBuffer authenticatorData;
+    readonly attribute any attestation;
+};